Today I did a lot of testing and tuning with the new unreleased beta version of ArduCopter code, known as "2.9.2ß" (V3 i think for the official exit), quad with APM V2.5 and U-Blox GPS by 3DRobotics.
The inertial control developed by Leonard and Randy, with the support of Jason, is finally giving the results that for over a year all we are waiting.
To be perfectly sure I've repeated this test at least 10 times in three different flight, with the same great performance.
As you can see from this image and video the max radius in Loiter is now not over one meter in windless/gusty winds and max two meters in strong crosswind, near the position hold performance of the best commercial product, DJI Wookong-M.
We are trying to improve the waypoint navigation but now we're here, the next release will be really a milestone.
We still have to solve a few problems related to the inertial control x/y/z, but I am sure that the excellent results achieved so far are to mean that we are on the right track.
I attach the telemetry log.
DJI, here we come...
-= AC Dev Team =-
EDIT: in my video you can see the version "3" of the code, nothing secret of course, is the current master branch on GitHub called at the moment "2.9.1b-DEV".
Jason Short on the dev list has proposed to move version from 2.9.1 to 3.x for the massive changes inside the code (ap_hal, PX4 support and other), and following its proposal I have appointed as such in my videos, that's all.